Question 1040625
You're doing great. Now you need to take the square root of that to get {{{sqrt(128) = sqrt(64*2) = sqrt(64)*sqrt(2) = 8*sqrt(2)}}}


So the exact diameter is {{{8*sqrt(2)}}} units


Use a calculator to find that {{{8*sqrt(2) = 11.3137084989848}}}


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Exact Diameter = {{{8*sqrt(2)}}} units
Approximate Diameter = {{{11.3137084989848}}} units